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PS cahpter 19

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Amber Dowdy

on 15 March 2011

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Transcript of PS cahpter 19

MIRRORS optics: the stody of how mirrors and lenses form images incoming ray: incident ray relfected ray: ray taht comes out What is the angle of relfection??? The law of reflection states that the angle fo reflection is = to the nagle of incidence What is a plane mirror? example? When you look in a plane mirror, you see your REVERSED reflection. a plane mirror always produces a virutal image What is a virtual image? Concave mirror? headlights, flashlights convex mirror? stores, side mirrors is car focal point? real image? Convex mirrors cause
light rays to spread out
& can only form virtual
images. concave mirrors: can form
real OR virutal images! 19.2
Lenses Light travels at the speed of 3.00 x 10^8 m/s in a vaccum. The speed of light in the new
medium depends on the material of
the new medium When light enters a new medium at an angle, the change in speed causes the light to bend or refrect. example: light passing
from air into glass or water index of refreaction? Concave lenses cause incoming
parallel rays to
spread out or diverge Concave lenses are used in viewfinders of cameras convex lenses: used in slide & movie projectors critical angle??? Total internal refelction?
Materials that have small cirtical angles are likely to cause most of the light entering them to be totally internally refelcted. 19.3
Opitcal Instruments What is a telescope? 2 main types:
1.) refelcting (uses mirrors & convex lenses to focus light
2.) refracting (uses convex lenses to flcus light camera? pinhole camera:
*credited to Leonardo da vinci
*Consits of a cardboardbox w/small hold in one side
*They can form an upside down real image Modern film camera:
*The light focused by the lens moved toward or away from the film reacts with a light sensitive chemical coating on the film that records the real image. Microscope?? 19.4
The Eye & Vision Parts of the eye: 1. cornea- transparent outer coating of the eye,
curved surface helps focus light entering eye 2. pupil - allows ligth rays to enter your eye 3. iris- controls amoutn of light entering eye 4. lens - sealed capsule containing clear fluid
*focuses the light onto the ligth sensor cells at the back of the eye 5. retina- inner surface of eye ~ where focused, refracted light is collected 6. rods & cones: light sensitive nerve endings that convert light into electrical currnets sent to the brain rods- low intensity= white black gray
cones- color, but need more light
3 type sof cones:
red, green, blue Vision Problems:
1.) Near sightedness: distanct objects become blurry, eye is too curved or too long, corrected with CONCAVE lens
2.) Far sightedness: nearby objects become blurry, cornea is not cureve dneough or too short, corrected with CONVEX lens
3.) astigmatism: distnace objects may appear blurry c the cornea or lens is mishapen
*specialized lends used t ocorrect
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